1、Keep fresh air indoor--The fresh air input from outdoor through exhausting the polluted air by positive pressure; while the polluted air to outdoor by negative pressure.  

2、Heat keeping, oxygenation, less consumption, energy saving, health keeping--During the whole process of air changing, import fresh air continually as breeze, to expel the polluted air out of refrigeration area, elevated temperature then exhaust out of door, without changing the air refrigeration indoor, which is the most reasonable scavenging device.

3、Design for special high-quality fan and unique air flue perfectly combines small fan, large volume, ultra-quiet.

4、Defend the sand--Don't worry about the bacteria and dust brought by sand. Though sand wrecks havoc, people can also enjoy the fresh air after filtering.

5、Prevent midge, theft and rain, then you can enjoy a happy life.

6、Add anion device, sterilizing, smoke abateing, dedusting, peculiar smell eliminating, thus to improve air quality, promote human health.

7、Add active carbon, make the air fresher, purer.